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Fair Value of Financial Instruments (Q3) (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value Transfers Between Levels [Abstract]      
Transfers from Level 1 to Level 2 $ 0 $ 0 $ 0
Transfers from Level 2 to Level 1 0 0 0
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 0
Fair Value of Financial Instruments [Abstract]      
Cash and cash equivalents 36,814,899 88,067,647 106,398,919
Quoted Prices in Active Markets (Level 1) [Member]      
Fair Value of Financial Instruments [Abstract]      
Cash and cash equivalents 36,814,899 88,067,647 106,398,919
Quoted Prices in Inactive Markets (Level 2) [Member]      
Fair Value of Financial Instruments [Abstract]      
Cash and cash equivalents 0 0 0
Significant Unobservable Inputs (Level 3) [Member]      
Fair Value of Financial Instruments [Abstract]      
Cash and cash equivalents $ 0 $ 0 $ 0